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Stockholders' Equity - Stock Awards (Details) - Restricted Stock - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Number of Other than Options        
Outstanding, beginning balance (in shares)     780,833  
Granted (in shares)     245,224  
Canceled (in shares)     0  
Vested (in shares)     (195,224)  
Expired/Forfeited (in shares)     0  
Outstanding, ending balance (in shares) 830,833   830,833  
Weighted Average Exercise Price        
Outstanding, beginning balance (in dollars per share)     $ 4.09  
Granted (in dollars per share)     1.65  
Canceled (in dollars per share)     0  
Vested (in dollars per share)     1.58  
Expired/Forfeited (in dollars per share)     0  
Outstanding, ending balance (in dollars per share) $ 3.96   $ 3.96  
Other disclosures        
Compensation expense $ 37,000 $ 10,000 $ 47,000 $ 33,000
Unrecognized compensation expense $ 84,000   $ 84,000  
Weighted average period of recognition     1 year 9 months